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  • to lightly sulcate. Beak (posterior point of shell) suberect, with deltidial plates conjunct (as symphytium) and mostly exposed, and bearing a small foramen...
    3 KB (322 words) - 12:11, 3 April 2023
  • beak, and conjunct deltidial plates, the foramen being of a 'permesothyrid' type. The hinge teeth are supported by dental plates, and the lophophore...
    2 KB (156 words) - 11:16, 23 January 2024
  • Thumbnail for Rhynchonelloidella alemanica
    foramen large, oval in shape, hypothyridid, with well developed rim; deltidial plates wide, disjunct to just conjunct; beak ridges angular, extending laterally;...
    6 KB (633 words) - 07:17, 8 June 2023
  • Thumbnail for Somalirhynchia
    midlength; beak erect and massive with small hypothyroid pedicle foramen; deltidial plates disjunct. Anterior commissure strongly uniplicate; lateral commissure...
    7 KB (727 words) - 23:42, 20 August 2022
  • Thumbnail for Sharpirhynchia
    in adult; foramen big, oval, hypothyridid, with well developed rim; deltidial plates narrow, disjunct to just conjunct; beak ridges subangular; interareas...
    6 KB (686 words) - 04:26, 8 March 2024
  • Thumbnail for Argyrotheca
    (submesothyridid to almost hypothyridid), leaving ample space for the small deltidial plates. The pedicle collar is well developed, and is supported by median ridge...
    16 KB (1,747 words) - 21:56, 2 June 2024